EP 2022887 B1 20120418 - PROCESS FOR PRODUCING BLEACHED PULP
Title (en)
PROCESS FOR PRODUCING BLEACHED PULP
Title (de)
VERFAHREN ZUR HERSTELLUNG VON GEBLEICHTEM ZELLSTOFF
Title (fr)
PROCÉDÉ SERVANT À PRODUIRE DE LA PÂTE À PAPIER BLANCHIE
Publication
Application
Priority
- JP 2007059930 W 20070515
- JP 2006137850 A 20060517
Abstract (en)
[origin: EP2022887A1] Provided are a method for producing bleached pulp, comprising processing unbleached pulp obtained by cooking a lignocellulose substance, for alkali-oxygen bleaching followed by treatment with peroxomonosulfuric acid and thereafter by multistage chlorine-free bleaching treatment starting from chlorine dioxide treatment; a method for producing bleached pulp, comprising processing the unbleached pulp for alkali-oxygen bleaching followed by chlorine-free bleaching treatment or totally chlorine-free bleaching treatment to bleach it to a degree of brightness of from 70 to 89 %, and further followed by treatment with peroxomonosulfuric acid; and paper produced by the use of the bleached pulp produced according to these production methods, at a papermaking pH of at most 6. Provided are the efficient production methods for bleached pulp in which the colour reversion resistance is enhanced in chlorine-free bleaching and the bleaching cost increase is prevented, and the paper produced by the use of the bleached pulp according to an acid papermaking process.
IPC 8 full level
D21C 9/10 (2006.01); D21C 9/14 (2006.01); D21C 9/16 (2006.01)
CPC (source: EP US)
D21C 9/144 (2013.01 - EP US); D21C 9/1036 (2013.01 - EP US); D21C 9/1042 (2013.01 - EP US); D21C 9/1084 (2013.01 - EP US); D21C 9/163 (2013.01 - EP US)
Designated contracting state (EPC)
FI SE
DOCDB simple family (publication)
EP 2022887 A1 20090211; EP 2022887 A4 20100915; EP 2022887 B1 20120418; BR PI0711822 A2 20120117; BR PI0711822 B1 20180925; CA 2652325 A1 20071122; CA 2652325 C 20150630; CN 101443514 A 20090527; CN 101443514 B 20121128; CN 102704305 A 20121003; CN 102704305 B 20140917; JP 2007308824 A 20071129; JP 4967451 B2 20120704; US 2009183845 A1 20090723; US 2013062026 A1 20130314; US 8268123 B2 20120918; US 8864942 B2 20141021; WO 2007132836 A1 20071122; ZA 200809453 B 20100224
DOCDB simple family (application)
EP 07743365 A 20070515; BR PI0711822 A 20070515; CA 2652325 A 20070515; CN 200780017527 A 20070515; CN 201210111622 A 20070515; JP 2006137850 A 20060517; JP 2007059930 W 20070515; US 201213571233 A 20120809; US 30113007 A 20070515; ZA 200809453 A 20081105